The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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joule-atomic mass unit relationship
 $(1 {\rm \ J})/c^2$
 Value  6.700 535 363 x 109 u
 Standard uncertainty  0.000 000 082 x 109 u
  Relative standard uncertainty   1.2 x 10-8
 Concise form  6.700 535 363(82) x 109 u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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